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Abstract

In this paper, we investigate the optimal carrier-to-sideband ratio (CSR) for optical double-sideband (DSB) signals in radio-over-fiber (RoF) transmission. A pre-distortion method based on spectral shaping is proposed to optimize the signal CSR and eliminate the dispersion-induced power fading. A 12 GHz RoF transmission over 29 km standard single mode fiber (SSMF) is experimentally demonstrated which reveals that pre-distorted DSB has a 4.4 dB improvement over the one without pre-distortion, and 1.2 dB sensitivity advantage over single sideband (SSB) both with optimal CSR. The pre-distortion method is also applied to multi-channel transmission. The multi-channel experiment shows that for all channels the dispersion-induced power fading effects can be simultaneously mitigated and the pre-distorted DSB signals have ~1 dB sensitivity improvement over the SSB signals.

(a) Back-to-back BER performance for optical SSB and DSB signals with different CSRs; (b)
Required received power at the BER of 10−3 versus unit phase shift per
GHz2 for back-to-back DSB signals with 3 dB CSR.

(a) BER curve for SSB signals with 0 dB SCR, DSB signals with 3 dB CSR with and without
pre-distortion after 29 km transmission; (b) Required received power at the BER of
10−3 versus unit phase shift per GHz2 for the Waveshaper
setting.

(a) BER curve of the middle channel for SSB signals with 0 dB CSR, DSB signals with 3 dB
CSR with and without pre-distortion in multi- channel transmission; (b) Required received
power at the BER of 10−3 for each channel.